Development And Characterization Of Rice Genotypes For Water Use Efficiency And Drought Resistance
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Development And Characterization Of Rice Genotypes For Water Use Efficiency And Drought Resistance
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Author : Anuj Kumar
language : en
Publisher:
Release Date : 2017
Development And Characterization Of Rice Genotypes For Water Use Efficiency And Drought Resistance written by Anuj Kumar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Rice categories.
Rice, the second largest staple food crop, uses 30% of global fresh water to complete its life cycle worldwide. Water deficits worldwide have become a serious problem affecting rice growth and ultimately grain yield. To solve the water problem globally, improvement of water use efficiency (WUE) and other drought resistance (DR) traits in rice genotypes would be a useful strategy using advanced genomics tools. In this study, our objectives were to 1) analyze phenotypes of the USDA rice mini-core collection (URMC) for WUE and DR related traits, 2) correlate drought response phenes for physiological traits and grain yield in the URMC, 3) utilize molecular genetic dissection of WUE and DR using genome-wide association (GWA) analysis in the URMC, and 4) conduct genome-wide meta-analysis of QTLs for DR traits and grain yield components under drought stress. In the results, 35 rice genotypes showing ≤25% reduction, 14 rice genotypes exhibiting 25-40% reduction, and 8 rice genotypes showing ≥40% reduction, were drought resistant, moderate drought resistant, and drought-sensitive for WUE, photosynthesis, biomass, and other DR traits under drought stress, respectively. The results suggest from the correlation analysis that strong correlation exists between major grain yield components (number of spikelets per panicle, number of filled and unfilled grains per panicle) and major morpho-physiological traits (plant biomass, photosynthesis, and WUEi). In the GWA analysis, 24, 16, 26, 10, 19, 23, 7, 17, 11, 14, 17, 15, 29, 12, 18, and 19 significant SNPs were highly associated with WUEi, TR, stomatal conductance, Ci & Ci/Ca , plant biomass, NOTs, RWC, LR, chlorophyll content, and chlorophyll fluorescence (Fv', Fm', Fv'/Fm', PhiPSII, ETR, and qN) and their identified candidate genes for WUEi and DR traits. In the meta-analysis, 13 genome-wide MQTLs were found useful containing higher number of QTLs, lower genetic distance with lower CI. Therefore, this information would be useful for the breeding community and geneticists to dissect the genetic architecture of WUE and DR traits for developing high yielding drought resistant rice genotypes.
Phenotypic And Gene Expression Analysis Of Diverse Rice Genotypes In Response To Drought
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Author : Miranti Rahmaningsih
language : en
Publisher:
Release Date : 2016
Phenotypic And Gene Expression Analysis Of Diverse Rice Genotypes In Response To Drought written by Miranti Rahmaningsih and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Rice categories.
Drought is one of the most limiting factors for rice (Oryza sativa L.) growth and development with vegetative and reproductive stages the most sensitive and distinct phases. During the vegetative stage, drought can cause reduction in growth and biomass accumulation. Moreover, water stress at reproductive stage can reduce yield significantly. Plants are protected against drought by three different mechanisms: drought avoidance, drought tolerance, and drought escape. An integrated approach combining physiology, breeding, and genomics could be an effective way to characterize and mitigate this problem. The objectives of this research were to (1) screen a diverse set of rice genotypes at both vegetative and reproductive stages for drought response; (2) characterize the genetic differences in mechanisms of drought response conferring drought stress resistance; and (3) study the expression patterns of genes that contribute to yield under water stress conditions. At the vegetative stage, drought was applied by withholding water at 50% of the field capacity for ten days, while in the reproductive stage drought was given at pre-anthesis for three to four days. Results from the first study showed that the diverse genotypes exhibit different drought resistance mechanisms. Padi Tarab Arab and N22 exhibit drought avoidance and tolerance mechanisms while GPNO 25912 exhibits a tolerance mechanism. Gene expression analysis using RNA from plants early after drought stress identified clear differences between resistant and sensitive genotypes. The resistant genotypes showed a high induction in the relative expression of drought stress genes under drought compared to control, while the three sensitive genotypes showed low, no, late, or inconsistent induction in expression. Results from the second study demonstrated that between the two types of samples for gene expression analysis in four different genotypes, the inflorescence gives a higher correlation with phenotypic measurements than the flag leaf during reproductive stage. Meanwhile, both invertase genes and transcription factors confer positive effects to drought resistance particularly in relation to number of grain per panicle and panicle length.
Drought Resistance In Crops With Emphasis On Rice
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Author : International Rice Research Institute
language : en
Publisher: Int. Rice Res. Inst.
Release Date : 1982
Drought Resistance In Crops With Emphasis On Rice written by International Rice Research Institute and has been published by Int. Rice Res. Inst. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Crop yields categories.
Rice Improvement
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Author : Jauhar Ali
language : en
Publisher: Springer Nature
Release Date : 2021-05-05
Rice Improvement written by Jauhar Ali and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-05 with Technology & Engineering categories.
This book is open access under a CC BY 4.0 license. By 2050, human population is expected to reach 9.7 billion. The demand for increased food production needs to be met from ever reducing resources of land, water and other environmental constraints. Rice remains the staple food source for a majority of the global populations, but especially in Asia where ninety percent of rice is grown and consumed. Climate change continues to impose abiotic and biotic stresses that curtail rice quality and yields. Researchers have been challenged to provide innovative solutions to maintain, or even increase, rice production. Amongst them, the ‘green super rice’ breeding strategy has been successful for leading the development and release of multiple abiotic and biotic stress tolerant rice varieties. Recent advances in plant molecular biology and biotechnologies have led to the identification of stress responsive genes and signaling pathways, which open up new paradigms to augment rice productivity. Accordingly, transcription factors, protein kinases and enzymes for generating protective metabolites and proteins all contribute to an intricate network of events that guard and maintain cellular integrity. In addition, various quantitative trait loci associated with elevated stress tolerance have been cloned, resulting in the detection of novel genes for biotic and abiotic stress resistance. Mechanistic understanding of the genetic basis of traits, such as N and P use, is allowing rice researchers to engineer nutrient-efficient rice varieties, which would result in higher yields with lower inputs. Likewise, the research in micronutrients biosynthesis opens doors to genetic engineering of metabolic pathways to enhance micronutrients production. With third generation sequencing techniques on the horizon, exciting progress can be expected to vastly improve molecular markers for gene-trait associations forecast with increasing accuracy. This book emphasizes on the areas of rice science that attempt to overcome the foremost limitations in rice production. Our intention is to highlight research advances in the fields of physiology, molecular breeding and genetics, with a special focus on increasing productivity, improving biotic and abiotic stress tolerance and nutritional quality of rice.
Breeding Rice For Drought Prone Environments
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Author : K. S. Fischer
language : en
Publisher: Int. Rice Res. Inst.
Release Date : 2003
Breeding Rice For Drought Prone Environments written by K. S. Fischer and has been published by Int. Rice Res. Inst. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Rice categories.
Information available for other cereals and the limited or circumstantial evidence available for rice indicate that we can now breed varieties that have improved yield under drought and produce high yields in the good seasons. This manual aims to help plant breeders develop such varieties.
Identification And Characterization Of Contrasting Genotypes Cultivars To Discover Novel Players In Crop Responses To Abiotic Biotic Stresses
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Author : Raul Antonio Sperotto
language : en
Publisher: Frontiers Media SA
Release Date : 2022-02-24
Identification And Characterization Of Contrasting Genotypes Cultivars To Discover Novel Players In Crop Responses To Abiotic Biotic Stresses written by Raul Antonio Sperotto and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-24 with Science categories.
Water Wise Rice Production
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Author : B. A. M. Bouman
language : en
Publisher: Int. Rice Res. Inst.
Release Date : 2002
Water Wise Rice Production written by B. A. M. Bouman and has been published by Int. Rice Res. Inst. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Rice categories.
Methodologies For Root Drought Studies In Rice
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Author : H. E. Shashidhar
language : en
Publisher: Int. Rice Res. Inst.
Release Date : 2012
Methodologies For Root Drought Studies In Rice written by H. E. Shashidhar and has been published by Int. Rice Res. Inst. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Rice categories.
Identification And Characterization Of Contrasting Genotypes Cultivars To Discover Novel Players In Crop Responses To Abiotic Biotic Stresses Volume Ii
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Author : Raul Antonio Sperotto
language : en
Publisher: Frontiers Media SA
Release Date : 2023-01-30
Identification And Characterization Of Contrasting Genotypes Cultivars To Discover Novel Players In Crop Responses To Abiotic Biotic Stresses Volume Ii written by Raul Antonio Sperotto and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-30 with Science categories.
Water Management In Irrigated Rice
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Author : B. A. M. Bouman
language : en
Publisher: Int. Rice Res. Inst.
Release Date : 2007
Water Management In Irrigated Rice written by B. A. M. Bouman and has been published by Int. Rice Res. Inst. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Rice categories.